Self-adaptive control method of heavy-duty vehicle AMT synchronizer

Abstract

A self-adaptive control method of a heavy-duty vehicle AMT synchronizer comprises the following steps that firstly, the synchronizer moves from an idling position to a synchronization point, a gear shifting executing mechanism electromagnetic valve is kept full open and continuously kept for a preset time t2, and a gearbox gear shifting executing mechanism rapidly reaches the synchronization point; secondly, rotation speed synchronization is conducted, by means of PWM control of the gearbox executing mechanism electromagnetic valve, it is guaranteed that a front mesh gear and a back mesh gearreach synchronization, and the synchronous state of the synchronizer is calculated and judged; thirdly, the synchronizer moves from the synchronization point to the gear engaging position, the gear shifting executing mechanism electromagnetic valve is fully open, a gearbox gear shifting executing mechanism is made to enter the gear engaged position, and when gear engaging is up to end, through real-time judgment of the speed of shifting fork displacement change, a softstop function is selected. By the adoption of the self-adaptive control method of the heavy-duty vehicle AMT synchronizer, thesynchronizer can be accurately controlled to reach a synchronization point, insufficient synchronous displacement and excessive synchronous displacement are avoided, the output synchronizing force iscorrected in real time, and accurate control over the rotation speed synchronization of the synchronizer is achieved.

Description

technical field [0001] The invention relates to an adaptive control method for an AMT synchronizer of a heavy-duty vehicle, which is particularly suitable for prolonging the service life of the synchronizer and improving the smoothness of gear shifting. Background technique [0002] At present, the traditional synchronizer control method widely used in China is the segmented control method of "displacement-synchronization force-displacement". Quickly reach the start point of synchronization; in the synchronization stage, the solenoid valve is controlled by PWM to complete the synchronization of the synchronizer; after the synchronization is completed, the solenoid valve is fully opened to quickly complete the gear shifting operation of the gearbox. [0003] The existing large AMT synchronizer control has the following defects: it is difficult to accurately grasp the time and control parameters of each stage of synchronization, and it takes a lot of time to debug; different v...

AI Technical Summary

Problems solved by technology

[0003] The existing large AMT synchronizer control has the following defects: it is difficult to accurately grasp the time and control parameters of each stage of synchronization, and it takes a lot of time to debug; different vehicles have differences in gearbox mechanical dimensions and assembly tolerances, and a single control parameter cannot To adapt to the differences in the mechanical structure of the gearboxes of different vehicles, resulting in shocks and gears in the gearbox when shifting gears; under different working conditions of the vehicle, there is a large difference in the speed difference between the front and rear of the synchronizer when shifting gears, which will lead to a large difference in the synchronization force Similarly, the traditional synchronizer control parameters are too single, unable to adapt to the control needs of different working conditions when shifting gears; affected by the external environment, especially low temperature and low pressure environments, it is necessary to adjust the shifting force to avoid shifting failures, etc. problem generation

[0005] This invention only performs adaptive control on the oil pressure value, without mentioning the control of synchronous force and time control, which will cause an impact on the synchronizer in gear

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